I found out the code for the first door, but it was almost impossible to put it in, maybe something is wrong with the hitboxes? It took a lot of tries and even careful inputs seemed to trigger twice or something. I treated the input on the floor like a Dance Dance Revolution mat and tried standing in the middle of the arrows. I went to the arrows and back to the middle, but it was impossible to hit the arrows that way.
And it took me very long to understand that the yellow light on the door means the code was wrong. I thought it would signal something else, maybe that I started to input the code (or similar). It would definitely help to see the arrows light up and maybe use a red color if the code is wrong.
Anyway, I still liked the idea and hope you can see my comment as constructive and I hope you keep going as a video game developer! :)